Add Google Sign-In/Sign-Up using Firebase Authentication

[nagarjunpl]

Currently, the website only supports normal email/password authentication. To improve user experience and provide a faster login option, we need to integrate Google Sign-In/Sign-Up using Firebase Authentication.

Tasks:

• Configure Firebase project for Google authentication

• Implement Google Sign-In button on login/signup page

• Handle authentication flow and user session management

• Update UI after successful login

Expected Outcome:
Users should be able to sign in or sign up with their Google account, and their session should be managed securely using Firebase.

[github-actions]

Thank you for raising this issue!

We'll review it as soon as possible. We truly appreciate your contributions! ✨

Meanwhile make sure you've visited the README.md, CONTRIBUTING.md, and CODE_OF_CONDUCT.md before creating a PR for this. Also, please do NOT create a PR until this issue has been assigned to you. 😊